【iOS】Swift6対応方法！Strict Concurrency Checking(厳密な並行性チェック)

例
Stored property 'プロパティ名' of 'Sendable'-conforming class 'クラス名' has non-sendable type 'データ型'; this is an error in the Swift 6 language mode
Main actor-isolated class property 'shared' can not be referenced from a nonisolated context; this is an error in the Swift 6 language mode

// MARK: 順番上下ローディング
@MainActor
final class LoadingViewModel: ObservableObject {

    @Published  private(set) var height: Double = 0
    @Published  private(set) var timerPublisher: AnyCancellable?
    
    public func onAppear() {
        startLoading()
    }
    
    public func onDisappear() {
        stopLoading()
    }
    
    private func startLoading() {
        timerPublisher = Timer.publish(every: 0.3, on: .main, in: .common)
            .autoconnect()
            .receive(on: DispatchQueue.main)
            .sink { [weak self] _ in
                guard let self else { return }
                self.height += 15
                if self.height == 30 {
                    self.height = 0
                    self.timerPublisher?.cancel()
                    DispatchQueue.main.asyncAfter(deadline: .now() + 1.0) { [weak self] in
                        // Task-isolated 'self' is captured by a main actor-isolated closure. main actor-isolated uses in closure may race against later nonisolated uses
                        guard let self else { return }
                        self.startLoading()
                    }
                }
            }
    }
    
    private func stopLoading() {
        height = 0
        timerPublisher?.cancel()
    }   
}

actor Score {
    private(set) var value: Int = 0

    func output(score: Int) {
        print("Score：\(score)")
    }
}

let score = Score()

Task {
    try await Task.sleep(nanoseconds: 1 * 1_000_000_000) // 1秒停止
    await score.update(score: 200)
    print("非同期処理1")
}

final class UserDefaultsRepository: @unchecked  Sendable {

    /// `UserDefaults`が`Sendable`ではないがスレッドセーフな設計
    private let userDefaults: UserDefaults = UserDefaults.standard

    /// Bool：保存
    public func setBoolData(key: String, isOn: Bool) {
        userDefaults.set(isOn, forKey: key)
    }

    /// Bool：取得
    public func getBoolData(key: String) -> Bool {
        return userDefaults.bool(forKey: key)
    }
}